import Vue from 'vue'

import 'normalize.css/normalize.css' // A modern alternative to CSS resets

import ElementUI from 'element-ui'
import 'element-ui/lib/theme-chalk/index.css'
import locale from 'element-ui/lib/locale/lang/en' // lang i18n
import '@/styles/index.scss' // global css

import App from './App'
import router from './router'
import store from './store'

import '@/icons' // icon
import '@/permission' // permission control

Vue.use(ElementUI, { locale })

Vue.config.productionTip = false
Vue.directive('real-img', async function (el, binding) {//指令名称为：real-img
  let imgURL = binding.value;//获取图片地址
  if (imgURL) {
      let exist = await imageIsExist(imgURL);
      if (exist) {
          el.setAttribute('src', imgURL);
      } 
  }
})

/**
* 检测图片是否存在
* @param url
*/
let imageIsExist = function(url) {
  return new Promise((resolve) => {
      var img = new Image();
      img.onload = function () {
          if (this.complete == true){
              resolve(true);
              img = null;
          }
      }
      img.onerror = function () {
          resolve(false);
          img = null;
      }
      img.src = url;
  })
}

new Vue({
  el: '#app',
  router,
  store,
  render: h => h(App)
})
